What does it mean when i feel my heart fluttering?

Flutter/palpitations: Palpitations/fluuters can come any time, and it can be scary for some folks. At times we don't know why, but sometimes there are reasons--anxiety/panic attacks, thyroid disease, medication side effects, drug/alcohol use/abuse, heart-attacks, fever/infections, heart-conductions problem, excessive caffeine/stimulants etc..If persistent/concerning to you, consult doc for an eval. Good luck.